Driving mechanism for presses



l Passed" Feb. 22, 1927.

UNITED STATES.

LnoroLn scHULL, or VIENNA, AUSTRIA'.

PATENT DRIVING MEcHANIsM Fon rnnssns.

Application mea Jul 13, 1925, serial No. 43,426, and in Austria 1km-en14, 1924.

This invention relates to improvements in 16 complished by means 4of theram which is` connected to the eccentric rod, and the eccentric which isdirectly'm'ounted on the shaft. Theim ulse which is thus imparted to theshaft o the press by means of the reaction ofhA the standard injuriouslyaffects the coupling members which connect the said shaft to av prnnarydriving member. These coupling members ordinarily have bolts, lugs orthe like or one of them, which enter into slots lo- .cated in the other.member of the cou ling, and these .slts permit a relative latera play ormovement therein of the entering parts. [n order to obviate thesedisadvantages, couplin -have been proposed in which the play 80 of t eenteringbolts or the like has een.

obviated. However, owing to the considerable ressure exerted by theentering driving 'menig'ers upon the walls of the slots, such devicesVhave not been a success, more particularly` because of thewnumerous andsudden` changes in driving force incidental vto the operationof fastrunning presses. -According to\ the present invention, which is very weadapted oreccentric presses provided with couplings of any"desired conlstruction and adapted to be thrown-in during the loperation, thedisadvantages just described/are obviat'ed by means of arranging anadditional frictiongcoupling, which is effective in case of a relativerotation of the two parts tobe coupled, opposite in direction to thedesired revolution thereof. l One embodiment of the present invention isillustratedby way of example on the accompanying sheet@ drawings inwhichlllig. 1 is a' sectional elevation'of a deyice lembodying subject-matter of the invention,

Fig. 2 isa transverse section of the -device shown in Fig. 1, thesection being taken on lille 2-1-2 of Eig. 1 in thedirection of thearrows,'and 5 10h the ram is actuated by an ec rangement.

Thereference character 1 designates the shaft of the eccentric press, onwhich `is Fig. 3- illustrates a front view of 4the armounted freelyrotatablea flywheel 2, the

boss 3 of the latter being provided with longitudinal recesses 4 (forexample` three re` cesses) at the ,left hand side face.` A clutchsleeve5 is keyed to the shaft 1 and it is provided with longitudinallyextending holes, in which pins 6 are slidably arranged. Acompression-spring 7 is located in a recess, partly extending througheach said pin, eacli said spring having the tendency to continuouslyforce the associated pin against'the flywheel ofthe press to enter oneof the recesses 4. f

Oneend of each spring 7 rests against the bottom ofthe hole, in the pin6, while .the other end of each said sprin is enga ed by the end ofy abolt 9, whic is slidaily mounted in the recess of the corresponding pin6. The left-hand. end of each bolt 9 l abuts the fixed frame of thepress. The cou-' pling just described is intended for' permitting arotation of the iywheel with respect to the sleeve in the direction ofthearrow P1 in'Fig. 2, the said rotation corresponding to thetransmission of power. In order to prevent any shockfrom beingtransmitted to the sleeve 5 because of the reaction of the tensedstandard, an additional friction coupling is prqvided. This isimmediately effective when because of the delivery ofenergy from thetensed standard, the sleeve 5 is Aurged to advance with respect to theflywheel, which would tend to produce a relative reverse movementbetween and said flywheel 2. l

A sleeve 11 is' provided at the outside said sleeve 5 thereof with aquick screw-thread and at the inside with a flat screw-thread ofvsmallpitch.' This sleeve 11 is screwed on the reduced end '10 of theeccentric shaft 1, the said end being furnished with va corresponding`flat screw-thread, .and an outer sleeve 12 providedwith a quickscrew-thread engages with the quick screw-thread of the inner sleeve 11.The outer sleeve 12 is provided with an annula'r `and conically shapedfriction-surface 1,3, which is ada ted to cooperate with acorrespondingl s aped 4conical surface located at one si e of the boss 3of the flywheel.l A screw-threaded pin 14 -is screwed into'the outerface of the sleeve 12, and one end of a tensin springl 15 is hooked intotheprojecting end of the' pin i i 14, while the other end of this s ringenlll gages the end of a in 16, screwe into the end 10 of the sha t 1.The pin-coupling arranged at the left side -of the flywheel, serves tocouple sleeve 5 and flywheel 2 to cause them to move in the properdirection (indicatedby the arrow P1 in Fig. 2), to transmit the powerfor the working stroke of the press: During the upstroke ofthe ram orplaten, the reaction of the standard imparts to the shaft of the pressand thus also to the sleeve 11, firmly connected with the same, atendency to advance with re- 'spect to the flywheel (equivalent to therelative rotation between the flywheel and the sleeve as indicated bythe arrow P2 in Fig. 2). That is, the pins 6 would tend to move towardsthe other ends of slots or recesses 4. Then the outer sleeve 12, whichis continuously urged towards the flywheel by the tension of the spring15, is coupled to the said flywheel by the action of the conicallyshaped friction-face 13, and a frictional clamping connection will beimmediately produced between the flywheel and'the shaft of the Tess bythe action of the quick righthande threads of members 11 and 12. The

.greatest part of the potential energy accuthe said flywheel, a sleevemounted upon said projecting end of the shaft and having an.

coupling means from their operative positions.

2. A driving mechanism for presses comprising a shaft, a flywheelmounted on said lshaft and revoluble with iespect thereto,

coupling means adapted to couple the said flywheel to the said shaftwhile permitting a relative movement between the said shaft and saidflywheel in opposite directions, and additional coupling means betweensaid flywheel and said shaft automatically operable bya relative turningof said shaft with respect to said flywheel in the normal direction ofmovement of the said shaft.

3. In a driving mechanism for presses, the combination of a shaft, aflywheel mounted on said shaft and freely Ievoluble with respectthereto, a sleeve keyed to said shaft and adapted to turn therewith,vsaid flywheel and said sleeve respectively having interfitting pins andrecesses adapted to couple them said pins being circumferentiallymovable in said recesses, and additional coupling means operative tocouple the said shaft and the said flywheel when the said pins move inthe said recesses away from their normal operative positions.

LEOPOLD SCHULL.

